feat: harden phase one workflows

miniapp/miniprogram/pages/products/detail.wxss

@@ -1,5 +1,63 @@
-.radio {
-  display: block;
-  height: 60rpx;
-  line-height: 60rpx;
+.detail-page {
+  padding-bottom: 60rpx;
+}
+
+.detail-hero {
+  overflow: hidden;
+  margin-bottom: 22rpx;
+  background: #ffffff;
+  border: 1rpx solid #e4eaf0;
+  border-radius: 16rpx;
+  box-shadow: 0 8rpx 24rpx rgba(20, 36, 58, 0.05);
+}
+
+.detail-cover {
+  width: 100%;
+  height: 360rpx;
+}
+
+.detail-info {
+  padding: 26rpx;
+}
+
+.detail-title {
+  margin-top: 14rpx;
+  color: #111827;
+  font-size: 40rpx;
+  font-weight: 900;
+  line-height: 1.2;
+}
+
+.detail-price {
+  margin-top: 18rpx;
+  color: #c2410c;
+  font-size: 42rpx;
+  font-weight: 900;
+}
+
+.purchase-card {
+  margin-bottom: 20rpx;
+}
+
+.form-title {
+  margin-bottom: 20rpx;
+}
+
+.radio-grid {
+  display: grid;
+  grid-template-columns: repeat(3, 1fr);
+  gap: 12rpx;
+  margin-bottom: 20rpx;
+}
+
+.radio {
+  min-height: 72rpx;
+  display: flex;
+  align-items: center;
+  padding: 0 12rpx;
+  background: #f8fafc;
+  border: 1rpx solid #e2e8f0;
+  border-radius: 14rpx;
+  color: #334155;
+  font-size: 24rpx;
 }